I haven’t read everything here so maybe this was mentioned. The Dunlop calipers have a built in stop to keep the pad backing plate from hitting the rotor when the pad it close to gone. The experience is what appears to be ample braking until you really need it then you don’t get what you are wanting. The cure is new pads.
Also, how did you squeeze the pistons in a vise without damaging the center pin that the pad slides onto?